利用DMV 查询效率低的sql语句

---查找应用程序中执行sql 效率低的sql 语句

SELECT execution_count [执行次数],

total_worker_time/execution_count AS [cpu执行时间],

Total_Elapsed_Time/execution_count as [总执行时间],

(SELECT SUBSTRING(text,statement_start_offset/2+1,

(CASE WHEN statement_end_offset = -1 then

LEN(CONVERT(nvarchar(max), text)) * 2

ELSE statement_end_offset

end -statement_start_offset)/2)

FROM sys.dm_exec_sql_text(sql_handle)) AS 执行语句

FROM sys.dm_exec_query_stats

ORDER BY [cpu执行时间] DESC

go